[ModuleInterface] Intro flags for the module-alias disambiguation feature

Author: xymus

include/swift/Option/FrontendOptions.td

@@ -904,6 +904,15 @@ def module_interface_preserve_types_as_written :
   HelpText<"When emitting a module interface, preserve types as they were "
            "written in the source">;
 
+def alias_module_names_in_module_interface :
+  Flag<["-"], "alias-module-names-in-module-interface">,
+  HelpText<"When emitting a module interface, disambiguate modules using "
+           "distinct alias names">;
+def disable_alias_module_names_in_module_interface :
+  Flag<["-"], "disable-alias-module-names-in-module-interface">,
+  HelpText<"When emitting a module interface, disable disambiguating modules "
+           "using distinct alias names">;
+
 def experimental_spi_imports :
   Flag<["-"], "experimental-spi-imports">,
   HelpText<"Enable experimental support for SPI imports">;